Drill.



Patented M21224, 19M

gwvmtoz R- E'- VHNDEKgRlFF flttomeq DRILL.

APPLICATION FILED SEPT.13, 1912.

R. E. VANDERGRIFP'.

ami Macaw MW: m.

ROBERT E. VANDERG-RJFF, 0F FELLOWS, CALIFORNIA.

DRILL.

Specification of Letters Patent.

Patented Mar. at, iota.

Application filed September 13, 1913. Serial No. 789,681.

To all whom it may concern:

Be it known that I, ROBERT E. VANDER- GRIFF, a citizen of the United States,,residing at Fellows, in the county of Kern and State of California, have invented certain new and useful Improvements in Drills, of which the following is a specification, reference being had to the accompanying drawings,

This invention relates to certain improvements in drills and has relation more particularly to a device of this general character especially designed and adapted for use in working stone and the object of the invention is to provide a drill of this general character wherein the cutting portions are comprised of a plurality of disks designed to rotate and including means of a novel and improved character whereby the disks are permitted to rotate with a minimum'of fric tion and wherein the mountings of the disks are effectually guarded against interference from foreign substances such as dirt or the like.

'The invention consists in the details of construction and in the combination and arrangement of the several parts whereby certain important advantages are attained and the device is rendered simpler, less expensive and otherwise more convenient and advantageous for use, all as will be hereinafter more fully set forth. I

The novel features of the invention will be carefully defined in the appended claims.

In order that my invention may be the better understood, I will now proceed to describe the same with reference to the .accompanying drawings, wherein Figure 1 is an enlarged sectional view taken through coacting rotary disks or bits constructed in accordance with my invention; Fig. 2 is a view in rear elevation, on a smaller scale, of one of the rotary disks or duced scale taken transversely through one.

of the disks or bits.

As disclosed in the accompanying drawings, 1 denotesthe drill head provided at one end with a screw-threaded stem 2 adapted to be engaged with a drill rod or tube or to any other means whereby the head may be rotated. The opposite end of the head is provided with the spaced legs 3-3 so twisted as to occupy parallel )lanes extending 1dlagiollially relatively to .he faces of the In close proximity to the free ends of each i shown is secured thereto through the medium of a reduced threaded portion 8 adapted for engagement with the threaded opening 9 suitably produced in the leg. The inward movement of the pin 7 relatively to the leg is limited by the annular shoulder 10 abutting with the inner face of the adjacent portion of the leg 3. a

The pin 7 has its innermost end provided with a head 11 adapted to limit any endwise movement of the disk 4 relatively to the pin, such head 11 serving to snugly hold the disk 4 in close proximity to the adjacent face of the coacting le 3. In order that the disk 4 may rotate about the pin 7 with a minimum of friction, I produce in the hub 5- an annular seat 14 adapted to accommodate roller bearings 15 such roller bearings being maintained against displacement by the head 11, as is believed to be clearly obvious from the'drawings, and such rollers 15 are adapted to contact with the adjacent surface of inclosing cap 17 disposed about the head 11 but rotatable with the disk 4, such cap 17 serving as a convenient and effective means for precluding the entrance of any foreign substances, such as dirt or the like within the hub 5 of the disk, as would otherwise tend to. interfere with the rotation thereof. I

also find it of advantage to preclude the entrance of any foreign substances Within the hub 5 from the inner end through the provision of the annular flan e 18 formed on the inner face of the leg 3 1n which the pin 7 is snugly seated 'While the inner end portion of the hub 5 is provided with the annular recess 19 adjacent its bore and adapted to snugly accommodate such flange 18. The annular recess 19 is of a depth eater than the height or thickness of t e annular flange 18 in order that there may be interposed between the outer face of the flange 18 and the base of the recess 19 the gasket- 20 which may be produced of any ordinary or preferred material.

Although forming no part of the present invention, it will be well to state that longitudinally of the head 1 are afforded the Water-passages 2l21, as is customary in drills of this general character.

From the foregoing descri tion, it is thought to be obvious that a drill constructed in accordance with my invention is'of a simple and comparatively inexpensive nature and is particularly well adapted for use by reason of the particular mountings for the rotary disks or bits whereby the 'same are permitted to o erate with a minimum of friction and are e ectually protected against any foreign substances as would interfere therewith and itwill also be obvious from the foregoing description that my invention is capable of some change and modification without material departure from the principles and scope thereof and for this reason I do not Wlsh to be understood as limiting myself to the precise arrangement and formation of the several parts, herein shown, in carrying out my invention in practice.

I claim:

1. A drill including a headhaving spaced legs, a pin detachably secured to each of the legs, a disk rotatably supported on the pin, such disk having a pro ected hub portion, and a closure detachably engagin the projected hub portion and inclosing tfie pin.

2. A drill including. a head having spaced legs, a pin inwardly projected from each of the legs and terminating in a rotatably mounted on the pin, thehub portion of such disk having a plurality of re" cesses provided in the face of the hub portion adjacent the pin, and rollers seated within one of the recesses and adapted to contact with the pin.

3. A device of the character described including a leg, a pin projecting from such leg, an annular flange on the leg'surrounding the pin and adapted to contact therewith, a disk mounted on the pin and having an annular recess in its hub portion adapted to accommodate the flange of the leg, and a gasket surrounding such pin and interposed between the flange of the leg and the base of the recess of the disk.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

ROBERT E. VANDERGRIFF.

Witnesses:

- E. M. JAMEs,

JosnPH P. DORLEY.

head, a disk 

